Sharpenihg-tooi



L. HERMANN.

SHARPENING TOOL.

APPLICATION FILED OCT. 28. 1916. RENEWED APR. 28. 1919.

Patented June 3, 1919.

G INVENTOR.

N 1 WM A TTORNEYS.

LOUIS I-IERMANN, OF CHICAGO, ILLINOIS.

SHARPENING-TOOL.

Specification of Letters Patent.

Patented June 3, 1919.

Application filed October 28, 1916, Serial No. 128,153. Renewed April 28, 1919. Serial N 0. 293,375.

To all'whom it may concern:

Be it known that I, LOUIS HERMANN, a citizen of the United States of America, and resident of Chicago, Cook county, Illinois, have invented a certain new and useful Improvement in Sharpening-Tools, of which the following is a specification.

My invention relates to improvements in tools, and more particularly to sharpening tools, or devices for the blades or knives of hair cutting shears, safety razors and the like, and the object of my invention is to provide an improved device of this character which will be simple, durable and reliable in construction, effective and efficient in operation and inexpensive to manufacture. r

Other objects of my invention Will appear hereinafter.

My invention consists in the features of novelty exemplified by the constructiony combination and arrangement of parts hereinafter described, shown in the accompanying drawings and 'more particularly set forth in the appended claims.

Referring to the drawings:

Figure 1 is a plan view of my improved device,fshowing a cutter orknife in position to be clamped;

Fig. 2 is a similar plan view showing the holder device in position for sharpening the lower blade of the hair cutting tool;

Fig. 3 is a transverse section on line 3 of Fig. 1;

Fig. 4 is a detail plan View of the holder shown in Fig. 2; v

Fig. 5 is a detail end View of the holder shown in Fig. 4; v

Fig. 6 is a detail transverse section on line 6-6 of Fig. 2.

The cutting knives or shears A and B of the usual or standard hair cutters each have a series of prongs or projections C which cooperate with the prongs G of the other cutter and in sharpening these cutters their cooperating faces D or surfaces are ground perfectly flat. The most satisfactory method of sharpening these cutters is to disassemble the structure and individually grind the faces of the knives on the smooth flat surface E of a hone or stone F of suitable material such as carborundum. Heretofore, however, it has been diliicult When using these hones or stones to grind the cutters uniformly and to properly maintain the knives or cutters in relation to the stone during the sharpening operation. I employ a stone F which is preferably rectangular in shape so as to present smooth, fiat grinding surfaces; In the surface I provide a lon itudinal groove G of any suit able, preferably rectangular, cross-section for the purpose of holding a removable guide member or bar H. This guide 1nember is preferably of the same shape in cross section as the groove or slot but when in place in said groove it rises above the grinding surface of the stone so as to provide a longitudinal shoulder or ledge J. This serves as a guide for the cutter. The operator places the cutter fiat upon the stone surface, as shown in Figs. 1 and 3, with its rear edge J against the guide shoulder and then reciprocates the cutter along the surface, applying sufiicient pressure to the cutter by placing his finger upon the upper side of the blade, and at the same time maintaining the cutter against the guide. This construction is provided for sharpening the upper blade of the standard cutting tool because this is usually flat and thin. -My

improved'device is adapted for sharpening the lower blade but on account of the difference in construction of the lower blade or knife, I provide a holder therefor. This holder is preferably made up of sheet metal punched and formed to the proper shapein order to render thedevice as inexpensive as possible. The structure shown in the drawings consists of a body plate L of metal which is slightly curved to conform gen erally to the upper surface of the lower cutter, the cutter being positioned between the plate L and the stone. The opposite edges L and L are slightly curved in opposite directions to form lips so as to insure the pressure of the hand being applied close to the edge of the cutter knife. This device is constructed in this manner so as to make it adaptable to different sizes of cutter knives, the standard cutter being made for the man .ket in two sizes, hence one side of the holder on the opposite side and are adapted to receive the smaller of the two sizes of cutter blades between them. The larger cutter blade is intended to fit between the lugs L I preferably make the holder of a comparatively soft metal, such as brass, so that the lugs L and L may be bent slightly either way to take care of any slight deviations in the dimensions of the cutter blades. The operator places the lower blade with its surface D upon the surface of the stone and then places the holder or operating device upon the blade using the side thereof corresponding to the size of the cutter blade. The lugs L or L as the case may be, embrace the cutter blade and maintain it in position with respect to the holder. The operator then reciprocates the blade and bolder along the grinding surface, exerting the proper pressure for the purpose. The lugs L and L project considerably beyond the cutter blades and act as guide lugs by cooperating with a longitudinal guide slot M in the stone, this being deep enough for the purpose and of the proper cross-sectional shape. The lugs L or L", as the case may be, which project upwardly serve as finger pieces or grips by which the operator may secure a firm yet convenient hold upon the device. The cutter blades of standard cutters usually have a central hole or opening N which constitutes ameans for holding the blades in position on the cutters, and this is utilized in my device for holding the blade against any rotary movement. The plate L has central lugs L punched up and properly positioned so that they engage in the holes in the cutter blades. Thus the cutter blade is held at three points; that is by the two lugs L and L as the case may be, and by the central lug L It is obvious that the shape and size of the stone and the number and arrangement of the guide slots may be varied without departing from the scope and spirit of my invention. The bottom surface 0 of the stone may be smooth and flat ifdesired for the purpose of honing the ordinary razor.

I claim:

1. The combination of a stone having a smooth grinding surface and a slot in said surface, and a removable guide bar in said slot projecting above the surface of the stone and forming a shoulder along which thedevice to be sharpened may be reciprocated.

2. The combination of a grinding stone having a fiat grinding surface, a removable guide member mounted thereon and presenting aguide shoulder for the blade to be sharpened and along which the blade may be reciprocated in contact with the surface.

3. The combination of a stone having a smooth grinding surface and a slot in said surface, a removable guide bar in said slot projecting above the surface of the stone and forming a shoulder against which the device to be sharpened may be simplified, a holdingdevice adapted to be placed upon the device to be sharpened and to confine the blade between the holder and stone, and means for guiding the blade and holder in a definite path along the stone.

4:. The combination of a honing stone having a smooth flat surface and having two, parallel slots, a removable guide bar in oneof said slots projecting above the surface of the stone and a separate blade holder for confining the blade between the holder and the surface of the stone and having means to engage the side edges of the blade and project into the other slot to guide'the holder and blade in a definite line of movement.

The combination of a honing stone having a smooth fiat grinding surface and two parallel slot-s or grooves in said surface, a removable guide bar in one of said slots and a blade holding device comprising a plate adapted to be positioned against the upper side of the blade and having downwardly projecting lugs cooperating with the said other slot or groove for guiding the plate in a definite line of movement.

Signed by me at Chicago, Illinois, this Q-Gth'day of October, 1916.

LOUIS HERMANN.

Witnesses: V

IGNACE IzsAK, D. S. KOBORAK.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C. 

